Cytron Technical Forum

\Hye.i has a problem and i need any ideas to solve this problem.i want uses GSM and Global Positioning System (GPS) modem installed inside busses and a personal computer that acts as GSM server that connects to each other. When the bus moves, an SMS is sent to the GSM server to be read, analyse and processed.so the sms can display/acquire the location, distance, speed and Estimated Time of Arrival (ETA)s of the bus to reach the bus stop.so.how product that i need to use.

In short, you need 2 GSM modems, a USB to RS-232 converter, a GPS module, a MCU with supporting circuit and also a MAX 232 circuit.

The connection for the GSM server should look like this:

PC --- USB to RS232 Converter --- GSM modem.


While the connection on the bus should be:

GPS --- MCU --- MAX232 --- GSM Modem.


Please take note that the MCU you choose should have at least 2 UART ports.

waiweng83 WROTE:In short, you need 2 GSM modems, a USB to RS-232 converter, a GPS module, a MCU with supporting circuit and also a MAX 232 circuit.

The connection for the GSM server should look like this:

PC --- USB to RS232 Converter --- GSM modem.


While the connection on the bus should be:

GPS --- MCU --- MAX232 --- GSM Modem.


Please take note that the MCU you choose should have at least 2 UART ports.

Thanks....but i still confious about gps module....gps module mean that i only use "32 Channel GPS Receiver" ..it's true?......then....MCU mean Multipoint Control Unit...but i can't imagine MCU like?....can i use SK-40C to interface between GPS module and MAX232.......

haneyf WROTE:Thanks....but i still confious about gps module....gps module mean that i only use "32 Channel GPS Receiver" ..it's true?......then....MCU mean Multipoint Control Unit...but i can't imagine MCU like?....can i use SK-40C to interface between GPS module and MAX232.......

You yourself are not sure which module to use? MCU is MicroController Unit.......

As waiweng83 said you will need a MCU with 2 UART. As far as I know, SK40C from Cytron is a starter kit that support 40 pin PIC MCU, not a complete PIC controller, you need to choose a PIC for it. The keywords here is "2 UART", you will need to search for PIC that have >= 2 UART, and 40 pin, then you can use it.

Thanks~That means..I must select looking for PIC microcontroller wiht 2 UARTs kan~orait....

Besides what others suggested, you can try to learn from this DIY project on how to generate UART using software approach too. But by using this method, your program gets more complicated.

boleh x u bg pendapat gps module mn yg sesuai untuk i gunakan...i pkan nk guna yg ini http://my.element14.com/jsp/search/prod ... ....adakah ia boleh integrate dgn pic nnt....ada x reference yg boleh i refer untuk coding gps ni....

haneyf,

Your link got problem. Try to edit it. Nway i still manage to open it...hehe.
Since this device uses RS232 or TTL serial for communication, so it can be used with any microcontroller with uart interface. Read more about RS232 vs TTL UART. However, i didn't see any communication protocol given in the datasheet at the website. It should be needed, but i'm not sure.

I can open the link too!

sorry..i'm update this link.. http://my.element14.com/jsp/search/prod ... ku=1546849